Sodium hydride → 2-(3-Cyano-3-(3,4-dichlorophenyl)propyl)oxytetrahydropyran

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Reaction Steps

A suspension of 17.75 g of sodium hydride (80% dispersion in oil) in 750 ml of THF is cooled in an ice bath, a solution of 100 g of 3,4-dichlorophenylacetonitrile in 250 ml of THF is added dropwise and the reaction mixture is stirred for two hours at RT. It is cooled to -20° C., a solution of 112.36 g of 1-bromo-2-(tetrahydropyran-2-yloxy)ethane in 120 ml of THF is added dropwise and the reaction mixture is stirred for 2 hours at RT. It is concentrated under vacuum, the residue is taken up with water and extracted with ether, the organic phase is washed twice with a buffer solution of pH 4, with a buffer solution of pH 7 and twice with saturated NaCl solution and dried over Na2SO4 and the solvent is evaporated off under vacuum. The residue is chromatographed on silica using toluene and then a toluene/AcOEt mixture (100/3; v/v) as the eluent to give 113.5 g of the expected product, which is used as such.

Provenance & Evidence